Calculate the equivalent total resistance of multiple resistors connected in parallel. Supports dynamic resistor chain sizing with instant conversions.
2 Resistors
3 Resistors
4 Resistors
Invalid inputs. Resistor values must be greater than zero.
Select the resistor count tab and enter your resistance values (R1, R2, R3, R4) in the inputs.
2
Calculate
Click the prominent teal CALCULATE button to solve the equivalent resistance formulas.
3
Get Results
The total combined parallel resistance is computed and visualized instantly inside the schematic circuit rails.
Resistors in Parallel Explanation
Formula:1/Rtotal = 1/R1 + 1/R2 + 1/R3 + 1/R4
In a parallel circuit, the reciprocal of the total resistance is the sum of the reciprocals of the individual resistances. The total resistance of a parallel combination will always be smaller than any individual resistor in the chain.
Voltage remains the same across all resistors, while the total current divides among the branches.
Parallel Resistance Formula Table
Parameter
Formula
Total Resistance
1/R = 1/R1 + 1/R2 + 1/R3 + 1/R4
Voltage
Same across all resistors
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